I can only speak for myself, but generally when I have been injured working around power tools
it generally occurs due to a lack of imagination on my part. I am thinking of what I want to happen, not
what else could happen along the way. As a teenager I got my hand cut up (I still have the scars) while
holding a piece of sharp triangularly shaped sheet metal in one hand and drilling through it with the other.
The drill caught and whipped that piece of metal out of my fingers and sliced my thumb and two fingers
pretty well. Looking back on it I can't imagine how I could NOT see that coming, but if I did I wouldn't
have done it.
Even when the power is off, I have given myself minor cuts once on a sharp live center and once
on a parting tool just because I wasn't paying attention to where my hands could end up relative to
these sharp tools.
There is a saying, "There is no education in the second kick of a mule", and I find that I don't repeat the mistakes
I have made in the past, but I'd just as soon not make the mistakes in order to get my lesson. Getting
advise from others with more experience is very helpful as is just stopping to think about how things could go differently
than I envision them. That second part is more difficult, it involves changing your mindset and it takes practice.